xorriso under mc is slow to open an ISO

Description

I opened a Debian Jessie netinst ISO (about 320MiB in size). xorriso was on the system and it took about 20 seconds to display the contents. Remove xorriso from the system and isoinfo displays them almost instantaneously.

This happened with versions 4.8.13 and 4.8.15. Please see Debian bug #805495